A small coin formerly used in the Papal States (parts of Italy), worth very little, or a tiny amount of money.
From Italian 'baiocco,' possibly from a place name or a Semitic root meaning 'brass' or 'copper,' referring to the metal composition of these minor coins.
Baiocs were so worthless that English travelers adopted 'not worth a baioc' as an expression—today we'd say 'not worth a penny,' but the phrase reminds us of a currency that's completely vanished.
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